21132186386 has 4 divisors (see below), whose sum is σ = 31698279582. Its totient is φ = 10566093192.

The previous prime is 21132186373. The next prime is 21132186419. The reversal of 21132186386 is 68368123112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 13025885161 + 8106301225 = 114131^2 + 90035^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5283046595 + ... + 5283046598.

Almost surely, 2^21132186386 is an apocalyptic number.

21132186386 is a deficient number, since it is larger than the sum of its proper divisors (10566093196).

21132186386 is a wasteful number, since it uses less digits than its factorization.

21132186386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10566093195.

The product of its digits is 82944, while the sum is 41.

The spelling of 21132186386 in words is "twenty-one billion, one hundred thirty-two million, one hundred eighty-six thousand, three hundred eighty-six".